1 - Roost and grouse
When you put a grouse in Roost , it wants 5 Wheat grain to give eggs, bird droppings and feathers.
Wheat grain need farming skill 27. If there is no Wheat grain, grouse does not give bird droppings, which can use for fertilizer.
Now a grouse in Roost gives an average of 2 bird droppings. If you must fertilize 50-100, fields, it will need at least 50 grouse , which is too much. Also, grouse found much less / harder
1 - Grouse to eat any seed - carrot, pumpkin, grapes, wheat, barley and so on. 2 - Nests, except eggs can give and (sometimes) bird droppings. 3 - Bird droppings may be collected on map(as Nests) with skill gathering.
2 - Farming skill and trees
To sow tree requires skill farming. Once the tree grows, it is to be cut should want the ability Lumbering. Actually shows again the ability farming, but when cut gives it experience to skill Lumbering
Once grow would be good to show the necessary level of Lumbering.
3 - Pick a sapling linked up with the skill farming or any other ?
If not, it may be associated with skill farming and, depending on skill farming level, to vary the success of different types of trees